Reachable assertion in QEMU vhost-vdpa

1) Reachable Assertion

EUVDB-ID: #VU78948

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-3301

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion. When a peer nic is still attached to the vdpa backend, it is too early to free up the vhost-net and vdpa structures. If these structures are freed here, then QEMU crashes when the guest is being shut down.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

QEMU: All versions

External links

http://bugzilla.redhat.com/show_bug.cgi?id=2128929
http://lists.gnu.org/archive/html/qemu-devel/2023-06/msg05460.html
http://gitlab.com/qemu-project/qemu/-/commit/a0d7215e339b61c7d7a7b3fcf754954d80d93eb8

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.